Shock

Shock

1. Classes

   • Hypovolaemic
     • Sudden decrease in blood volume
     • Causes
       • Haemorrhage
       • Severe dehydration
       • Severe burns
       • D/ V
   • Vasculogenic/ septic
     • Severe vasodilation- Increase in vascular space
       • Endotoxin released from bacteria causing v.d
       • Anaphylaxis
   • Cardiogenic
     • Heart can't fill properly
     • Heart can't empty properly

2. 3 Stages

   • Reversible
     • 1. Non-progressive
       • Activation of compensatory mechanisms
     • 2. Progressive
       • Blood pooling, tissue hypoperfusion, cell damage
   • 3. Irreversible
     • Anaerobic metabolism
       • Build up of waste products
     • Ischaemia
       • Hypoxia
       • Necrosis

3. Failure of C.V system to perfuse vital organs due to imbalance between blood volume and vascular volume